AH1891
MINIATURE MICROPOWER OMNIPOLAR
HALL EFFECT SWITCH
AH1891
Document number: DS35207 Rev. 1 - 2
1 of 7
www.diodes.com
April 2011
?Diodes Incorporated
Description
The AH1891 is a miniature micropower Omnipolar Hall effect
switch IC with dual outputs specifically designed for portable
and battery powered equipment such as cellular phones and
portable PCs. To support battery powered equipment the
AH1891 has been optimized to operate over the supply range
of 1.8V to 3.3V and uses a sleep function to give an average
supply current of only 7uA. To minimize PCB space the
AH1891 is packaged in the small CSP package
(0.8mmx0.8mm) and the design integrates the external pull
up resistors to simplify the applications circuit.
The outputs of the AH1891 are switched with either a North or
South pole of sufficient strength. When the magnetic flux
density (B) is larger than operate point (Bop), Output 1 will
pull low and Output 2 will be inverted (high). The output states
are held until B is lower than release point (Brp).
The AH1891 is available in U-WLB0808-4 package.
Features
" Omnipolar (North or South) operation
" Low supply voltage of 1.8V to 3.3V
" Micropower operation
" Dual outputs for design flexibility
" Internal pull up and pull down capability
" Chopper stabilized design for:
o Superior temperature stability
o Superior temperature stability
o Superior temperature stability
" Good RF noise immunity
" -40癈 to 85癈 Operating Temperature
" ESD 4KV in Human Body Mode
" Miniature CSP package 0.8mm x 0.8mm
Pin Assignments
A1 A2
B1 B2
(Top View)
A2
A1
B2
B1
(Bottom View)
Applications
" Cellular phones
" Portable PCs and PDAs
" Digital cameras
" Portable and battery powered applications
Typical Application Circuit
AH1891
Output 1
GND
Output 2
Vdd
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